updated examples

app/.cargo/config

app/.gitignore

app/.vscode/.cortex-debug.peripherals.state.json

app/.vscode/.cortex-debug.registers.state.json

app/.vscode/launch.json

app/.vscode/tasks.json

app/Cargo.toml

app/README.md

app/build.rs

app/examples/allocator.rs

app/examples/blinky.rs

app/examples/crash-semihosting.rs

app/examples/crash.rs

app/examples/device.rs

app/examples/exception.rs

app/examples/hello-itm.rs

app/examples/hello-semihosting.rs

app/examples/hello.rs

app/examples/panic-halt.rs

app/examples/panic-itm.rs